A248894 Numbers k such that both numbers k and k+1 are in the sequence A248903.

17, 69, 70, 241, 405, 2606, 3339, 4116, 7116, 15148, 15149, 20162, 137633, 324410, 332504, 439298, 1012547, 1121608, 2482209, 5028662, 6330857, 7180864, 7180865, 9569168, 14452770, 17021632, 110229972, 110229973, 193329301

Offset: 1

Author

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

Keywords

• nonn
• more

Comments

If k is in the set {69, 15148, 7180864, 110229972, ...} then both numbers k and k+1 are in the sequence. This means that k, k+1 and k+2 are in the sequence A248903. It seems that there exist more such numbers k.

Crossrefs

Cf. A001359, A248891, A248903.

Extensions

a(13)-a(29) from Jinyuan Wang, Nov 28 2020